Don’t line your dekas up with your SC unless you have outlying turrets to deter people from dropping kessen in line with your dekas.
Don’t run sonics unless they are at least lvl 9. Swap them for RFTs until then.
Your base is extremely vulnerable to having the SC tripped by a single ithorian at which point the contents will be lured to a corner with a lugga or WED droid. And that’s if the SC doesn’t get sniped by kessen...which it probably will.
Center layouts can be hit or miss because an opponent has access to so much of the base with so few troops. They’re very dependent on high level defensive structures and armory equipment as the design limits the concentration of turret fire to 2-3 turrets on a single enemy at a time. A corner defense might be a better option as jt often lures players into attacking from a specific direction and allows you to tailor your turret positioning to take advantage of it.
This game unfortunately has HQ 10 sandbaggers who have manipulated the matchmaking system to find and obliterate bases (clubbing baby seals) like yours somethong. If that’s the case sorry dude. Most of us want that fixed.